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Research on the dry intrusion accompanying the low vortex precipitation

Science china Earth Sciences 2007年第9期50卷 1396-1408页

作者： YAO XiuPing1,2,3. WU GuoXiong1, ZHAO BingKe4, YU YuBin3.& YANG GuiMing2,5 1 LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, china 2 Institute of Heavy Rain, china meteorological {3., Wuhan 43.074, china 3.0} meteorological {3. training Center, Beijing 100081, china 4 Shanghai Typhoon Institute of china meteorological {3., Shanghai 20003., china 5 National meteorological Center of the china meteorological {3., Beijing 100081, china 1. LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Institute of Heavy Rain China Meteorological Administration Wuhan 430074 China 3. china meteorological administration {3. Center Beijing 10081 China 4. Shanghai Typhoon Institute of china meteorological administration Shanghai 200030 China 5. National meteorological Center of the china meteorological {3. Beijing 100081 China

By employing the 6.7μm satellite vapor cloud images and NCEP/NCAR 1°×1° reanalysis datasets, the characteristics and mechanism of the dry intrusion, as well as its impacts on the low vortex precipita- tion at the Meiyu front are explored in this paper. It is found that the formation,development and main- tenance of the low vortex precipitation at the Meiyu front are closely related to the evolution of the dry intrusion. The dry intrusion is characterized by high potential vorticity (PV), low humidity and cold air. The dry intrusion exhibits as an obvious dark zone on vapor cloud images, an area in which atmos- pheric relative humidity is lower than 60%. However, the features of the dry intrusion on the vapor im- ages are clearer than that of the humidity field, for the former is the digital vapor cloud images with high temporal and spatial resolution, and it can be used to explore the finer characteristics of the develop- ment, evolution and supplement of the intrusion during the development of the low vortex. The dry intrusion impacts accompanying the low vortex precipitation at the Meiyu front come from all levels of the troposphere, with the strongest intrusion located at the upper troposphere. The dry and cold air intrudes the vicinity of the low vortex from the upper isentropic surface to the lower one, slanting eastward from lower to higher level. The low vortex precipitation region is usually situated in front of the dry intrusion where the relative humidity gradient is higher. The research also reveals that the mechanism of the dry intrusion is that the high potential vorticity descends from the upper troposphere to the lower level, therefore, the dry intrusion can be used as an important index of the high PV forcing. To the west of the low vortex precipitation, the upper level northerlies descend across the isentropic surface, then the dry cold advection can trigger the instable development in the mid-low troposphere. The dry intrusion enhances the low vort

关键词： Meiyu front, low vortex precipitation, dry intrusion, mechanisim, vapor image, potential vorticity, relative humidity

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The characteristics of sea fog with different airflow over the Huanghai Sea in boreal spring

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Acta Oceanologica Sinica 2010年第4期29卷 3-12页

作者： HUANG Jian WANG Xin ZHOU Wen HUANG Huijun WANG Dongxiao ZHOU Faxiu Institute of Tropical and Marine Meteorology China Meteorological Administration Guangzhou 510080 China Guy Carpenter Asia-Pacific Climate Impact centre School of Energy and Environment City University of Hong Kong Hong Kong China CAS key laboratory of tropical marine environmental dynamics South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Department of meteorology Ocean University of China Qingdao 262003 China

Using the observations from ICOADS datasets and contemporaneous NCEP/NCAR reanalysis datasets during 1960-2002,the study classifies the airflows in favor of sea fog over the Huanghai （Yellow） Sea in boreal spring （April-May） with the method of trajectory analysis,and analyzes the changes of proportions of warm and cold sea fogs along different paths of *** to the heat balance equation,we investigate the relationships between the marine meteorological conditions and the proportion of warm and cold sea fog along different airflow *** major results are summarized as follows.（1） Sea fogs over the Huanghai Sea in spring are not only warm fog but also cold *** proportion of warm fog only accounts for 44% in April,while increases as high as 57% in May.（2） Four primary airflow paths leading to spring sea fog are *** are originated from the northwest,east,southeast and southwest of the Huanghai Sea,*** occurrence ratios of the warm sea fog along the east and southeast airflow paths are high of 55% and 70%,while these along the southwest and northwest airflow paths are merely 17.9% and 50%.（3. The key physical processes governing the warm/cold sea fog are heat advection transport,longwave radiation cooling at fog top,solar shortwave warming and latent heat flux between airsea interfaces.（4） The characteristics of sea fog along the four airflow paths relate closely to the conditions of water vapor advection,and the vertical distribution of relative humidity.

关键词： spring sea fog over the Huanghai Sea airflow paths water vapor flux heat advection vertical distribution of water vapor

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Variations of Snow Temperature and their Influence on Snow Cover Physical Parameters in the Western Tianshan Mountains,china

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Journal of Mountain Science 2011年第6期8卷 827-837页

作者： CHEN Xia WEI WenShou LIU MingZhe GU GuangQin Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Hebei Key Laboratory for Meteorology and Eco-environmen Shijiazhuang 050021 China HeBei Climate Center Shijiazhuang 050021 China Institute of Desert Meteorology China Meteorological Administration Urumqi 830011 China Tianshan Station for Snow-cover and Avalanche Research Chinese Academy of Sciences Urumqi 830011 China

This article discussed about snow temperature variations and their impact on snow cover parameters. Automatic temperature recorders were used to sample at lo-minute intervals at the Tianshan Station for Snow-cover and Avalanche Research, Chinese snow temperature Academy of Sciences. lo-layer and the snow cover parameters were measured by the snow property analyzer （Snow Fork） in its Stable period, Interim period and Snow melting period. Results indicate that the amplitude of the diurnal fluctuation in the temperature during Snow melting period is 1.62 times greater than that during Stable period. Time up to the peak temperature at the snow surface lags behind the peak solar radiation by more than 2.5 hours, and lags behind the peak atmospheric temperature by more than 0.2 hours during all three periods. The optimal fitted function of snow temperature profile becomes more complicated from Stable period to Snow melting period. 22 h temperature profiles in Stable period are the optimal fitted by cubic polynomial equation. In Interim period and Snow melting period, temperature profiles are optimal fitted by exponential equation between sunset and sunrise, and by Fourier function when solar radiation is strong. The vertical gradient in the snow temperature reaches its maximum value at the snow surface for three periods. The peak of this maximum value occurs during Stableperiod, and is 4.46 times greater than during Interim period. The absolute value of temperature gradient is lower than 0.1℃ cm-1 for 3. cm beneath snow surface. Snow temperature and temperature gradient in Stable period-Interim period indirectly cause increase （decrease） of snow density mainly by increasing （decreasing） permittivity. While it dramatically increases its water content to change its permittivity and snow density in Snow melting period.

关键词： Snow temperature Vertical temperaturegradient Optimal fitting function Snow density Western Tianshan Mountains china

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Influence of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific on the inter-decadal variations of the stratosphere-troposphere exchange of water vapor

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Science china Earth Sciences 2008年第8期51卷 1179-1193页

作者： ZHAN RuiFen1,2&LI JianPing2 1Shanghai Typhoon Institute of china meteorological administration,Shanghai 20003.,{3. 2State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,{3. 1. Shanghai Typhoon Institute of china meteorological administration Shanghai 200030 China 2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

This study investigates the Stratosphere-Troposphere Exchange(STE) of water vapor,emphasizes its interdecadal variations over Asia in boreal summer,and discusses the influences of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific(WNP) on them by using the Wei method with reanalysis data from the European centre for Medium-Range Weather Forecasts(ECMWF) for the years of *** climatology shows that the upward transport of water vapor across the tropopause in boreal summer is the most robust over the joining area of the South Asian Peninsula and Indian-Pacific Oceans(defined as AIPO).The upward transport over there can persistently convey the abundant water vapor into the stratosphere and then influence the distribution and variation of the stratospheric water *** analysis shows that interdecadal variations of the water vapor exchange over the AIPO are significant,and its abrupt change occurred in the mid-1970s and the early *** these three periods,as important channels of the water vapor exchange,the effect of Bay of Bengal-East Asia as well as South china Sea was gradually weakening,while the role of the WNP becomes more and more *** studies show that atmospheric heat sources over the Tibetan Plateau and the WNP are two main factors in determining the interdecadal variations of water vapor *** thermal influences over the Tibetan Plateau and the WNP have been greatly adjusted over the pass 44 *** synthesis influences the interdecadal variations of the water vapor exchange by changing the Asian summer monsoon,but their roles vary with time and *** after 1992,the influence of heat source over the Tibetan Plateau remarkably weakens,while the heat source over the WNP dominates the across-tropopause water vapor *** have important implications for understanding the transport of other components in the atmosphere and estimating the impact of human activities(

关键词： Tibetan Plateau tropical western North Pacific atmospheric heat source STE inter-decadal variations

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Numerical simulation of non-Archie electrophysical property of saturated rock with lattice Boltzmann method

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Petroleum Science 2009年第1期6卷 24-28页

作者： Yue Wenzheng Tao Guo Liu Dongming Yang Wendu State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum Beijing 102249 China Research centre of Well Logging CNPC Key Laboratory of Well Logging China University of Petroleum Beijing 102249 China CNPC Logging Changqing Business Division Xi＇an Shaanxi 710201 China Sichuan Petroleum administration Logging Company Ltd. CNPC Chongqing 401147 China

The electrophysical property of saturated rocks is very important for reservoir identification and evaluation. In this paper, the lattice Boltzmann method （LBM） was used to study the electrophysical property of rock saturated with fluid because of its advantages over conventional numerical approaches in handling complex pore geometry and boundary conditions. The digital core model was constructed through the accumulation of matrix grains based on their radius distribution obtained by the measurements of core samples. The flow of electrical current through the core model saturated with oil and water was simulated on the mesoscopic scale to reveal the non-Archie relationship between resistivity index and water saturation （I-Sw）. The results from LBM simulation and laboratory measurements demonstrated that the I-Sw relation in the range of low water saturation was generally not a straight line in the log-log coordinates as described by the Archie equation. We thus developed a new equation based on numerical simulation and physical experiments. This new equation was used to fit the data from laboratory core measurements and previously published data. Determination of fluid saturation and reservoir evaluation could be significantly improved by using the new equation.

关键词： Non-Archie relation digital core model lattice Boltzmann method numerical simulation rock physical experiment

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Cloning and characterization of proliferating cell nuclear antigen gene of Alexandrium catenella (Dinoflagellate) with respect to cell growth

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Acta Oceanologica Sinica 2010年第3期29卷 90-96页

作者： HUANG Jian LIANG Shan SUI Zhenghong MAO Yunxiang GUO Hao College of Marine Life Sciences Ocean University of China Qingdao 266003 China National Marine Environmental Monitoring centre State Oceanic Administration Dalian 116023 China Department of Life Science Yangtze Normal University Chongqing 408000 China

Harmful algal blooms （HABs） have been affecting negatively the shellfish and aquaculture industries around the world. Though a lot of efforts have been made to disclose the changes of environmental factors involved and their effects on the HABs events, the molecular mechanism of this process remains unclear. To address this problem, proliferating cell nuclear antigen gene （pcna） was isolated and characterized from Alexandrium catenella. It showed high homology to those of other dinoflagellates （89% and 91% homology to Pfiesteria piscicid and Pyrocystis lunula, respectively）, and also 42%–43. homology to those of plant and animals. The expression level of pcna revealed by quantitative real time PCR was the lowest at the late lagging cell growth phase, increased to the highest at the late exponential phase, and then decreased at the stationary phase. Though the cell growth rate was also changing, no positive correlation between pcna expression level and cell growth rate was displayed throughout the whole cell growth stages （r 2 =0.024 6）. However, the pcna expression level had the similar trend with the change of cell growth rate throughout the whole growing process, e.g., from increasing at the earlier cell growth stage to decreasing at the following stages, though slightly lagging to the latter.

关键词： Alexandrium catenella gene growth harmful algal blooms proliferating cell nuclear antigen

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Important population viability analysis parameters for giant pandas(Aliuropoda melanoleuca)

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动物学研究 2012年第3期 18-24页

作者： Minghao GONG1,2,*,Yanling SONG2,Zhisong YANG3.Chen LIN1 1.Wildlife Monitoring centre,Academy of Forest Inventory and Planning,State Forestry administration,Beijing 100714,china 2.Institute of Zoology,the Chinese Academy of Sciences,Beijing 100101,china 3.Institute of Rare Animals and Plants,china West Normal University,Nanchong 63.002,china

Population viability analysis(PVA) is a tool to evaluate the risk of extinction for endangered species and aid conservation *** quality of PVA output is dependent on parameters related to population dynamics and life-history;however,it has been difficult to collect this information for the giant panda(Aliuropoda melanoleuca),a rare and endangered mammal native to china,confined to some 3. fragmented habitat *** giant pandas are long-lived,mature late,have lower reproductive rates,and show little sexual dimorphism,obtaining data to perform adequate PVA has been ***,we develop a parameter sensitivity index by modeling the dynamics of six giant panda populations in the Minshan Mountains,in order to determine the parameters most influential to giant panda *** data shows that the giant panda populations are most sensitive to changes in four female parameters:initial breeding age,reproductive rate,mortality rate between age 0 and 1,and mortality rate of *** parameter sensitivity index strongly correlated with initial population size,as smaller populations were more sensitive to changes in these four *** model suggests that demographic parameters of females have more influence on the results of PVA,indicating that females may play a more important role in giant panda population dynamics than ***,reintroduction of female individuals to a small giant panda population should be a high priority for conservation *** findings form a technical basis for the coming program of giant panda reintroduction,and inform which parameters are crucial to successfully and feasibly monitoring wild giant panda populations.

关键词： Giant panda PVA Population parameter Parameter sensitivity index

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Operational retrieval of Asian sand and dust storm from FY-2C geostationary meteorological satellite and its application to real time forecast in Asia

Operational retrieval of Asian sand and dust storm from FY-2...

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“2010年北京气象学会中青年优秀论文评选”学术研讨会

作者： X.Q.Hu~(1,3.,N.M.Lu~1,T.Niu~2,and P.Zhang~1 1 Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites(KLRCV),National Satellite meteorological Center,china meteorological {3.(NSMC/CMA),Beijing 100081,china 2 centre for Atmosphere Watch & Services(CAWAS),Chinese Academy of meteorological Sciences,china meteorological {3.(CMA),Beijing 100081,china 3.Institute of remote sensing applications,Chinese Academy of Sciences,Beijing 100101,china

This paper describes an operational retrieval algorithm for the sand/dust storm(SDS) from FY-2C/SVISSR (Stretched-Visible and Infrared Spin-Scan Radiometer) developed at the National Satellite meteorological Center (NSMC) of *** algorithm,called Dust Retrieval Algorithm based on Geostationary Imager(DRAGI), is based on the optical and radiative physical properties of SDS in mid-infrared and thermal infrared spectral regions as well as the observation of all bands in the geostationary imager, which include the Brightness Temperature Difference (BTD) in split window channels,Infrared Difference Dust Index(IDDI) and the ratio of middle infrared reflectance to visible *** also combines the visible and water vapor bands observation of the geostationary imager to identify the dust clouds from the surface targets and meteorological *** output product is validated by and related to other dust aerosol observations such as the synoptic weather reports,surface visibility,aerosol optical depth(AOD) and ground-based PM *** the SDS-IDD product and a data assimilation scheme,the dust forecast model CUACE/Dust achieved a substantial improvement to the SDS predictions in spring 2006.

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Decadal variations of the relationship between the summer North Atlantic Oscillation and middle East Asian air temperature

Decadal variations of the relationship between the summer No...

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作者： Jianqi Sun,Huijun Wang,and Wei Yuan 1 Nansen-Zhu International Research centre(NZC),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijmg,china. 2 china {3. administration training centre,Beijmg,china.

[1]The relationship between the summer(July-September) North Atlantic Oscillation (SNAO) and simultaneous East Asian air temperature is *** results show that the SNAO is related to middle East Asian summer air temperature,however this linkage varies with time on decadal timescale:a strong connection appears after the late 1970s but a weak connection before the late *** analysis indicates that this instable relationship may have resulted from the shift of the SNAO mode around the late *** the period of 1979-2003.the centers of the SNAO mode are located more eastward.A positive-phase(negative-phase) SNAO produces a strong lower-level divergence(convergence) over the Asian jet entrance region,in turn stimulates a strong upper-level convergence(divergence) via the Ekman *** a convergence (divergence) then excites a zonally oriented quasi-stationary barotropical Rossby wave train along the Asian upper-level *** the SNAO signal is transported eastward to East Asia,resulting in an anomalous summer air temperature over middle East Asia. However,in the period of 1951-1975,the centers of the SNAO mode are located more *** associated upper-level divergence/convergence is away from the Asian jet entrance region,and the SNAO signal cannot be transported eastward to East *** the connection is broken.

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Operational retrieval of Asian sand and dust storm from FY-2C geostationary meteorological satellite and its application to real time forecast in Asia

Operational retrieval of Asian sand and dust storm from FY-2...

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第七届全国优秀青年气象科技工作者学术研讨会

作者： X. Q. Hu1,3. N. M. Lu1, T. Niu2, and P. Zhang1 1Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites (KLRCV), National Satellite meteorological Center, china meteorological {3. (NSMC/CMA), Beijing 100081, china 2centre for Atmosphere Watch & Services (CAWAS), Chinese Academy of meteorological Sciences, china meteorological {3. (CMA), Beijing 100081, china 3.nstitute of remote sensing applications, Chinese Academy of Sciences, Beijing 100101, china

This paper describes an operational retrieval algorithm for the sand/dust storm （SDS） from FY-2C/SVISSR （Stretched-Visible and Infrared Spin-Scan Radiometer） developed at the National Satellite meteorological Center （NSMC） of china. This algorithm, called Dust Retrieval Algorithm based on Geostationary Imager （DRAGI）, is based on the optical and radiative physical properties of SDS in mid-infrared and thermal infrared spectral regions as well as the observation of all bands in the geostationary imager, which include the Brightness Temperature Difference （BTD） in split window channels, Infrared Difference Dust Index （IDDI） and the ratio of middle infrared re?ectance to visible re?ectance. It also combines the visible and water vapor bands observation of the geostationary imager to identify the dust clouds from the surface targets and meteorological clouds. The output product is validated by and related to other dust aerosol observations such as the synoptic weather reports, surface visibility, aerosol optical depth （AOD） and ground-based PM10 observations. Using the SDS-IDD product and a data assimilation scheme, the dust forecast model CUACE/Dust achieved a substantial improvement to the SDS predictions in spring 2006.

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